1. Poxviruses and Vaccine Design, Division of Viral Diseases, Directorate of Science Reference and Surveillance, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
2. Special Pathogens, Division of Health Security and Response, Directorate of Scientific Operations and Response, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
3. Department of Microbiology and Immunology, The University of Texas Health Science Center, San Antonio, Texas, USA